[填空题]
Estimate how many molecules of ai lzksyw2rn51j9e+vk1n q*qz u20v 2lf r are ighu; mv4 atz:.n each 2.0-L breath you inhale that were also in the last breath Galileo took. [Hint: Assume the atmosphav:g;4t. h umzere is about 10 km high and of constant density.] $\frac{molecules}{breath}$